Question

types of acids present in fruits and vegetable juices

Answer 1

the category of acid present in the fruits and vegetables is called organic acids
following are the acid present to sent in some fruits and vegetables:

citric acid --sour fruits like lemon , oranges , etc
tartaric acid --in baking soda
maliac acid --Apple
oxalic acid --tomato

Answer 2

citiric acid
oxalic acid 
formic acid
these acids are present in fruits and vegetable